Cognex camera is a professional industrial camera, which is usually used in machine vision system. In machine vision, cognex camera can acquire image information by scanning line by line or sampling point by point, and convert it into digital signals. For these digital signals, we can carry out various image processing and analysis, such as edge detection and feature extraction. In a digital image, the brightness of each pixel is called gray value, which is usually expressed in numbers, ranging from 0 to 255. The higher the gray value, the brighter the pixel, and vice versa. Therefore, the gray value of cognex camera can be used to describe the brightness of different parts of the image and provide basic data for the analysis and decision-making of machine vision.
In addition, in order to obtain more accurate gray values, it is necessary to pay attention to the settings of camera exposure, white balance, contrast and other parameters, as well as the reduction of background noise.